Marine engine flushing device



FIG. 1 is a front side perspective view of the device showing my new design with a cap thereon;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof, and the right side being the same;

FIG. 4 is top perspective view thereof; and,

FIG. 5 is a bottom perspective view thereof. 

The ornamental design for a marine engine flushing device, as shown and described. 